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Sunday, March 27, 2016

Common Garden Pests

It's that time of year again. It's SPRING and we're working in the garden. We've had quite a few requests for organic pest control methods so we're about to share our Organic Pest Control series once again. First, let's identify common garden pests

APHIDS

From Garden.org

Aphids are found throughout the United States. These small,
soft-bodied insects may be pale green, pink, black, or yellow, depending
on the species. Some stages of the life cycle are winged, others
wingless. Aphids feed on a wide variety of plants, including most edible
and ornamental plants. Clustering on tips of new growth and leaf
undersides, they suck plant juices causing leaves to become distorted
and yellow.

Aphids secrete a sugary fluid called honeydew that attracts ants and
may cause the growth of a sooty black fungus on leaves. In small
numbers aphids do little damage, but they reproduce rapidly. They can
also spread diseases among plants.

Found throughout the U.S., the cabbageworm is the larva of a common
white butterfly with three to four black spots on its wings. The damage
done by these caterpillars is similar to that of the cabbage looper --
the pests chew large, ragged holes in the leaves of cabbages, broccoli,
Brussels sprouts, and cauliflower, and may bore into the heads, leaving
trails of dark green frass (droppings). There are several generations
per year.

COMPANION PLANTS to deter CABBAGE WORMS:

Plant tomatoes, onions, garlic, and sage around cabbage to deter the worm

CORN EARWORM

From Garden.org

This pest is common throughout North America. The adult is an inch-long
tan moth that lays yellow eggs on leaf undersides in the spring. The
caterpillar larva has alternating light and dark stripes that may be
green, pink, or brown. This first generation of caterpillars feeds on
the leaves. Eggs of later generations are laid on corn silk; the
emerging caterpillars feed on the silk and the kernels at the tip of the
ear just inside the husk. In some cases this same caterpillar feeds on a
variety of plants and hence has many common names: tomato fruitworm,
cotton bollworm, geranium budworm. It also is know to feed on beans,
peas, peppers, potatoes, and squash.

CUCUMBER BEETLE

There are two forms of cucumber beetle -- one striped and the other
sporting a dozen black spots.

Cucumber beetles are pests of far more
plants than their name indicates. In addition to cucumbers and their
relatives (squashes, gourds, and melons), these beetles are known to
feed on beans, peas, corn and blossoms of several wild and cultivated
plants. The spotted cucumber beetle feeds on an even wider array of
cultivated plants, adding potatoes, beets, tomatoes, eggplants, and
cabbage to its menu. The larva of the spotted cucumber beetle is also
known as the southern corn rootworm. In addition to corn roots, it
infests peanuts, small grains and many wild grasses. You may find them
feasting on your roses and dahlias, as well.

Cucumber beetles are more dangerous to their cucumber-family hosts
than many pests, because they transmit deadly diseases -- mosaic and
bacterial wilts.

The adults overwinter in weeds and plant debris. They emerge in spring
after the last frost and enter gardens once the growing season is
underway. You may first notice them inside squash flowers. They lay
orange eggs at the base of host plants; white larva with legs and brown
heads emerge to chew on roots. Short northern seasons allow just one
generation a year, but in the South and milder parts of the West, two or
more generations are typical.

COMPANION PLANTS to deter CUCUMBER BEETLE:

Sow two or three radish seeds in cucumber or squash hills to repel
cucumber beetles and squash bugs. Nasturtiums are edible annual flowers
that are easy to grow and make good companions for cucumber and squash

CUTWORMS

Several kinds of surface-feeding caterpillars are known as cutworms.
Their name reflects their feeding habit, which is to chew plant stalks
until they are cut through. They feed on many garden plants, and are
especially fond of seedlings. Cutworms emerge at night, curling
themselves around plant stalks to feed. Cutworms hide during the day,
usually an inch or so below ground and near the scene of the crime.

There are three types of cutworms, each characterized the site of
feeding: on plant roots; on seedlings at ground level; on buds above
ground level. Adult cutworms are dark-colored, night-flying moths.

LEAFMINER

Though many different insects are known as leafminers the most common
are the larvae of tiny black flies. They tunnel between the upper and
lower layers of leaf tissue creating visible random trails, or mines, in
the process.

Adult flies lay eggs on the undersides of leaves. After hatching,
larvae tunnel into leaves to feed, gaining some protection from
predators there. They are pests to beets, chard, lettuce, peppers,
potatoes, and spinach.

NEMATODES

(too small to show a picture)

Below is the damage done by nematodes

Various species of these microscopic worms are found all over North
America, but they are a more severe problem in the South. They feed on
the roots of a wide variety of plants, including tomatoes, celery,
beans, and spinach. Infected plants are stunted and yellow, may wilt in
hot, dry weather, and can die if badly infested. Other symptoms include
roots with many small, round nodules on them, and taproots that develop
many small side roots such as in the image at left. Nematodes are spread
via infected soil, water, tools, and plants. Damage is similar to that
caused by other stresses that injure roots; have your soil tested for
nematodes to verify that they are the culprit.

PICKLE WORM

From Garden.org

This caterpillar is mainly a problem in the southeastern United States.
It feeds on the blossoms, stems, and developing fruits of summer squash,
and occasionally cucumbers and muskmelons. The adult moths emerge in
spring after overwintering as pupae in semitropical areas such as
southern Florida. They migrate northward to lay eggs on leaves, buds,
stems, and fruits of susceptible plants. There may be four or more
generations per year depending on the climate.

SQUASH VINE BORERS

From Garden.org

Squash vine borers are pests of crops east of the Rockies. The adult is a
moth that lays its eggs on the stems near the base of the plant in late
spring to early summer. Fat, white caterpillars with brown heads hatch
out and tunnel into the stems to feed, causing sudden wilting of all or
part of a squash vine. If you cut open the stem of the wilted vine
lengthwise, you'll find it filled with sawdustlike frass (droppings) and
one or more caterpillars. The borer prefers squashes but will
occasionally infest cucumbers and melons as well. In the Deep South
there can be two generations per year; in the North, only one.

COMPANION PLANTS to deter SQUASH BORER:

Sow two or three radish seeds in cucumber or squash hills to repel
cucumber beetles and squash bugs. Nasturtiums are edible annual flowers
that are easy to grow and make good companions for cucumber and squash

THRIPS

(too small to see)

Below is damage done by Thrips

Unless you have a magnifying glass, you probably won't see these tiny
pests on your plants, but you may notice signs of their presence,
including black, shiny speckles (droppings), silvery stippling (masses
of tiny discolored scars on plant parts), or, in severe cases, deformed
growth.

Magnification shows thrips to be shiny, elongated blackish or
yellowish insects. Adults have feathery, fringed wings, and nymphs lack
wings. There are many generations per year. Thrips prefer to feed on
new, rapidly growing plant tissue where it is easy to hide. Most feeding
by thrips causes only slight damage, but high populations can be quite
destructive. Feeding thrips can prevent rose buds from opening, and
results in deformed petals. Certain species spread viruses to tomatoes
and impatiens. Thrips also attack asparagus, cabbage, lettuce, onions,
peas, flowers, and fruit and shade trees.

Found throughout the United States, these large, fat
caterpillars feed voraciously on the leaves and fruits of tomatoes,
peppers, eggplants, and potatoes. Adults are rather spectacular sphinx
moths: grayish-brown with orange spots on the body and a 4- to 5-inch
wing span. After overwintering in the soil in 2-inch brown
spindle-shaped pupal cases, moths emerge in late spring to early summer
to lay greenish-yellow eggs on the undersides of leaves. Caterpillars
feed for about a month, then enter the soil to pupate. There is one
generation per year in the North; two or more in the South.

WHITEFLY

From Garden.org

This pest is found throughout the United States. The tiny insects
feed in large numbers by sucking plant juices from the leaves and stems
of many plants, including tomatoes, cucumbers, lettuce, flowers, trees,
and shrubs.

Whiteflies secrete a sticky, sugary substance called honeydew that
may cause the growth of a sooty black fungus on leaves. Eggs laid on
leaf undersides hatch into tiny larvae that look like flat, oval,
semitransparent scales. The larvae reach adulthood within a about a
month of hatching.

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